Adult emergence and F1 generation egg and larval production after γ-irradiation of late pupae of Grapholita molesta (Lepidoptera: Tortricidae)
Keywords:
egg hatch, F1 progeny, generic phytosanitary radiation dose, oviposition, pharate adultsAbstract
The late pupal stage (pharate adult) of Grapholita molesta (Busck) (Lepidoptera: Tortricidae) close to adult emergence was irradiated with doses up to 350 Gy to determine a dose that could serve as a phytosanitary treatment against Lepidoptera that may pupate in shipped commodities. Adult emergence was not significantly reduced below that of the non-irradiated control until the dose reached 200 Gy. Not until the dose had been increased to 150 Gy was the number of eggs laid significantly less than the control, and oviposition was completely prevented at ≥ 300 Gy. Egg hatch was not significantly reduced compared with the non-irradiated control until the dose reached 150 Gy, and no eggs hatched at ≥ 250 Gy. This study supports a generic radiation dose for pupae of Lepidoptera of at least 250 Gy.
Resumo
A fase de pupa de Grapholita molesta (Busck) (Lepidoptera: Tortricidae) próximo a emergência de adultos foi irradiada com doses de até 350 Gy para se determinar a dose suficiente para o tratamento fitossanitário contra esse espécie de lepidóptero em produtos vegetais para a exportação. A emergência de adultos não foi significativamente reduzida em relação ao controle não irradiado quando as pupas foram irradiadas com doses de até 200 Gy. Foi observado também que na dose de 150 Gy o numero de ovos postos pelas fêmeas foi significativamente menor do que no controle não irradiado, mas a oviposição foi completamente inibida com uma dose de ≥ 300 Gy. Já a eclosão de larvas com doses de até 150 Gy não foi significativamente reduzida quando comparadas ao controle não irradiado, além disso, não houve eclosão de larvas na dose de ≥ 250 Gy. Este estudo concluiu que uma dose de radiação genérica para pupa deste Lepidóptero deve ser de pelo menos 250 Gy.
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